deps: V8: partially revert d868eb7

d868eb7 ended up being an inadvertant ABI change. Remove the call to
CheckMemoryPressure from the header itself.

PR-URL: #24499
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Yang Guo <yangguo@chromium.org>
Reviewed-By: Myles Borins <myles.borins@gmail.com>

deps/v8/include/v8-version.h

@@ -11,7 +11,7 @@
 #define V8_MAJOR_VERSION 6
 #define V8_MINOR_VERSION 2
 #define V8_BUILD_NUMBER 414
-#define V8_PATCH_LEVEL 70
+#define V8_PATCH_LEVEL 71
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)

deps/v8/include/v8.h

@@ -10247,28 +10247,15 @@ uint32_t Isolate::GetNumberOfDataSlots() {
 
 int64_t Isolate::AdjustAmountOfExternalAllocatedMemory(
     int64_t change_in_bytes) {
-  const int64_t kMemoryReducerActivationLimit = 1024 * 1024;
   typedef internal::Internals I;
   int64_t* external_memory = reinterpret_cast<int64_t*>(
       reinterpret_cast<uint8_t*>(this) + I::kExternalMemoryOffset);
   int64_t* external_memory_limit = reinterpret_cast<int64_t*>(
       reinterpret_cast<uint8_t*>(this) + I::kExternalMemoryLimitOffset);
-  int64_t* external_memory_at_last_mc =
-      reinterpret_cast<int64_t*>(reinterpret_cast<uint8_t*>(this) +
-                                 I::kExternalMemoryAtLastMarkCompactOffset);
   const int64_t amount = *external_memory + change_in_bytes;
 
   *external_memory = amount;
 
-  int64_t allocation_diff_since_last_mc =
-      *external_memory_at_last_mc - *external_memory;
-  allocation_diff_since_last_mc = allocation_diff_since_last_mc < 0
-                                      ? -allocation_diff_since_last_mc
-                                      : allocation_diff_since_last_mc;
-  if (allocation_diff_since_last_mc > kMemoryReducerActivationLimit) {
-    CheckMemoryPressure();
-  }
-
   if (change_in_bytes < 0) {
     *external_memory_limit += change_in_bytes;
   }